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Reg. 95
MATERIALS OF CONSTRUCTION

COVERED ELECTRODES FOR METAL ARC WELDING OF MILD STEEL

Requirements for Normal Penetration Electrodes

Initial Tests.- The following initial tests on each brand of electrodes shall be carried out:-

(a) All Weld-Metal Tensile Tests.- Three all-weld-metal tensile test specimens, one each using the smallest, 6 S.W.G., and the largest diameter electrodes manufactured in this grade shall be prepared, and tested in accordance with the method described in Appendix H-1. The ultimate tensile stress of each test specimen shall be not less than 26 tons per square inch and yield stress not less than 20 tons per square inch. The elongation shall be not less than 25 per cent and the minimum reduction of area shall be not less than 35 per cent.

(b) Fillet Weld Hot Cracking Test.- One fillet weld hot cracking test shall be carried out as specified in Appendix H-1. The electrodes shall be deemed to be satisfactory provided no hot cracking occurs under the conditions of test. Greater cracks may be neglected provided they do not run into the full Section of the weld.

(c) Transverse Tensile Test.- One transverse tensile test shall be carried out for each welding position for which the electrode is recommended by the manufacturer except that two tests shall be required for the flat position. For electrode recommended for all positions, a test in the inclined position is not required.

The ultimate tensile stress shall be not less than 28 tons square inch. The method of preparation of the test pieces is specified in Appendix H-1.

(d) Transverse Bend Test.- Two bend tests one with the face and the other with the root in tension shall be carried out for each welding position for which the electrode is recommended by the manufacturer, except that two in each shall be carried out for those intended for flat position only. For electrodes recommended for all positions a test in the inclined position is not required. The method of preparation and carrying out the test shall be in accordance with Appendix H-1. The electrode shall be deemed to be satisfactory provided that on completion of the test, no crack or defect at the outer surface is greater than 1/8 inch measured across the specimen or 1/16 inch measured along its length. Premature failures at corners of the test specimen shall not be considered a cause for rejection.

(e) Cruciform Fillet Weld Tensile Test.- One Cruciform fillet weld tensile test shall be carried out for each welding position for which the electrode is recommended by the manufacturer, except that when the electrode is recommended for both the flat and the horizontal – vertical positions, test in the flat position shall not be required. The method of preparation of the test pieces and of carrying out the tests shall be as specified in Appendix H-1. These test pieces shall be capable of withstanding an ultimate tensile load of not less than 36.5 x W x C tons: where W is the width of the test piece and C is the average throat thickness of the welds, both in inches. C shall be taken as 0.7 x the average leg length or as the actual mean throat thickness, whichever is the greater.

(f) All-Weld Metal Impact Test.- Three Izod impact test specimens, one each using the smallest size manufactured, 6 S.W.G., and the largest size manufactured electrodes respectively, shall be prepared and tested in accordance with the method specified in Appendix H-1. The average of the three impact values for each test specimen shall be not less than 30 ft. lbs.

 
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